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/*
* Copyright (C) 2016 Canon Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions
* are required to be met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Canon Inc. nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CANON INC. AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL CANON INC. AND ITS CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(STREAMS_API)
#include "JSDOMPromiseDeferred.h"
#include "ReadableStreamDefaultController.h"
#include <wtf/Optional.h>
namespace WebCore {
class ReadableStreamSource : public RefCounted<ReadableStreamSource> {
public:
virtual ~ReadableStreamSource() { }
void start(ReadableStreamDefaultController&&, DOMPromiseDeferred<void>&&);
void pull(DOMPromiseDeferred<void>&&);
void cancel(JSC::JSValue);
bool isPulling() const { return !!m_promise; }
protected:
ReadableStreamDefaultController& controller() { return m_controller.value(); }
const ReadableStreamDefaultController& controller() const { return m_controller.value(); }
void startFinished();
void pullFinished();
void cancelFinished();
void clean();
virtual void setActive() = 0;
virtual void setInactive() = 0;
virtual void doStart() = 0;
virtual void doPull() = 0;
virtual void doCancel() = 0;
private:
std::optional<DOMPromiseDeferred<void>> m_promise;
std::optional<ReadableStreamDefaultController> m_controller;
};
inline void ReadableStreamSource::start(ReadableStreamDefaultController&& controller, DOMPromiseDeferred<void>&& promise)
{
ASSERT(!m_promise);
m_promise = WTFMove(promise);
m_controller = WTFMove(controller);
setActive();
doStart();
}
inline void ReadableStreamSource::pull(DOMPromiseDeferred<void>&& promise)
{
ASSERT(!m_promise);
ASSERT(m_controller);
m_promise = WTFMove(promise);
setActive();
doPull();
}
inline void ReadableStreamSource::startFinished()
{
ASSERT(m_promise);
std::exchange(m_promise, std::nullopt).value().resolve();
setInactive();
}
inline void ReadableStreamSource::pullFinished()
{
ASSERT(m_promise);
std::exchange(m_promise, std::nullopt).value().resolve();
setInactive();
}
inline void ReadableStreamSource::cancel(JSC::JSValue)
{
clean();
doCancel();
}
inline void ReadableStreamSource::clean()
{
if (m_promise) {
m_promise = std::nullopt;
setInactive();
}
}
} // namespace WebCore
#endif // ENABLE(STREAMS_API)
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